Iodine gives blue colour with:

glucose

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lactose

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starch

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heparin

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Solution

The correct option is C starch
Iodine gives a blue colour with starch.

The iodine test is used to test for the presence of starch. Starch turns into an intense "blue-black" colour upon addition of aqueous solutions of the triiodide anion, due to the formation of an intermolecular charge-transfer complex.

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On treatment with iodine, the presence of starch gives blue-black colour because

Iodine reacts with ____ in the food to give a blue-black colour.

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